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I need to get the Book of Plenix from Irune, but I'm not even sure if that's a person in the Citadel or a planet in the galaxy.

Where do I find Irune?

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up vote 14 down vote accepted

Irune is a planet in the Aethon Cluster.

This system doesn't appear until you've advanced to a certain point in the main story (I believe after Tuchanka). Once you're able to travel there, you want to head to the Aru system (default from the relay). There you will be able to scan Irune to recover the book after pinging the planet.

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It's either Tuchanka or the attack on the Citadel. Those happened basically one after the other for me, so I can't remember what opened up in between. – MBraedley Mar 12 '12 at 11:03

Aethon Cluster will not populate until Ashley Williams is on your team.

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Ash is DEAD in mine :) It showed after Citadel – user22734 Mar 29 '12 at 20:02
Anthony cluster will populate after Tuchanka. You don't have to have Ashley. – user36567 Nov 5 '12 at 18:33

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